Signal transfer system of programmable controller

Details Signal transfer system of programmable controller Signal transfer system of programmable controller

1991-07-01

1993-06-29

Smith, Jerry

Boots, shoes, and leggings

395275, 364DIG1, 3642382, 3642383, G05B 1101

Patent

active

052240312

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a signal transfer system of a programmable controller (PC) used to control a machine tool, and more specifically, to a signal transfer system of a PC by which the arrangement of I/O signals can be easily changed.


BACKGROUND ART

Programmable controllers (PCs) are widely used for the control, etc. of a machine tool. The programmable controller (PC) includes a programmable machine controller (PMC) incorporated in a numerical control apparatus and a programmable controller arranged independently of the numerical control apparatus.
Both of these PCs are interposed between the machine tool and the numerical control apparatus, to enable many I/O signals to be transferred therebetween, but the arrangement of these I/O output signals in the numerical control apparatus is different from that at the entrance of the PC. More specifically, the numerical control apparatus has a predetermined standard arrangement of I/O signals by which it adjusts itself to many kinds of machine tools, but each machine tool does not always use all of the I/O signals of the numerical control apparatus and thus has a different arrangement of the I/O signals. Accordingly, when a sequence program of the PC is created, the arrangement of these signals must be changed.
Nevertheless, when the number of the I/O signals is increased, a sequence program having a considerable number of steps must be created to change the arrangement of these signals, which imposes a burden upon the creation of the program. Further, when a detailed specification of a machine tool is changed, the sequence program must be changed, which makes the sequence program incompatible and causes maintenance problems.


DISCLOSURE OF THE INVENTION

Taking the above into consideration, an object of the present invention is to provide a signal transfer control system of a PC by which the arrangement of I/O signals is easily changed.
To solve the above problem, according to the present invention, there is provided a signal transfer control system of a programmable controller for transferring I/O signals between the PC and an external device, which comprises an I/O signal region for storing the I/O signal to the external device, mapping data for defining the mapping of the I/O signals, point data for defining the addresses to which the I/O signals are to be transferred, based on the mapping data, and an I/O data region for storing the I/O signals.
The input signals are stored in the I/O signal region and each of the I/O signals is mapped by the mapping data and the point data determines the address to which each of the mapped input signals is to be transferred. Namely, the addresses to which the input signals are to be transferred are determined by the mapping data and the point data, and the input signals are then transferred to the I/O data region. Conversely, the output signals are transferred from the I/O data region to the I/O signal region by the point data and the mapping data.
Therefore, even if the arrangement of these I/O signals is changed, the change can be dealt with by changing the point data or the mapping data without the need to change a sequence program.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram explaining the change of the arrangement of I/O signals of a signal transfer control system of a PC; and
FIG. 2 is a block diagram of the entire hardware of a numerical control apparatus (CNC) embodying the present invention.


BEST MODE OF CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to drawings.
FIG. 2 is a block diagram of the entire hardware of a numerical control apparatus (CNC) embodying the present invention. A programmable machine controller (PMC) 20 is incorporated in a numerical control apparatus (CNC) 10, and a processor 11, which controls the numerical control apparatus (CNC) 10 as a whole, reads out a system program stored in a ROM 13, through a bus 19, and controls the numerical control apparatus (CNC) 10 as a whole according to the

REFERENCES:
patent: 4455621 (1984-06-01), Pelley et al.
patent: 4831582 (1989-05-01), Miller et al.
patent: 4878002 (1989-10-01), Hentzig et al.
patent: 5032975 (1991-07-01), Yamamoto et al.

Affiliated with

Also associated with

Rating

Signal transfer system of programmable controller does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Signal transfer system of programmable controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal transfer system of programmable controller will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1760617